Bump minimist, mkdirp and webpack

Bumps [minimist](https://github.com/minimistjs/minimist) to 1.2.8 and updates ancestor dependencies [minimist](https://github.com/minimistjs/minimist), [mkdirp](https://github.com/isaacs/node-mkdirp) and [webpack](https://github.com/webpack/webpack). These dependencies need to be updated together.


Updates `minimist` from 1.2.0 to 1.2.8
- [Changelog](https://github.com/minimistjs/minimist/blob/main/CHANGELOG.md)
- [Commits](minimistjs/minimist@v1.2.0...v1.2.8)

Updates `mkdirp` from 0.5.1 to 0.5.6
- [Changelog](https://github.com/isaacs/node-mkdirp/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-mkdirp@0.5.1...v0.5.6)

Updates `webpack` from 1.12.2 to 5.88.2
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v1.12.2...v5.88.2)

---
updated-dependencies:
- dependency-name: minimist
  dependency-type: indirect
- dependency-name: mkdirp
  dependency-type: indirect
- dependency-name: webpack
  dependency-type: direct:development
...

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Author: dependabot[bot]